Isaiah 45:17 - Matthew Poole's English Annotations on the Holy Bible

With an everlasting salvation; not for a short time, as it was in the days of the judges and of the kings, under whom their dangers and calamities did frequently return upon them; but unto all ages, as it follows; whence it appears that he speaks not only nor chiefly of their deliverance out of Babylon, which was far from being complete or perpetual, as appears both from Scripture, as Ezra 9:8, and elsewhere, and from other authors; but of their redemption by Christ, by which this was truly and fully verified unto a great number of Israelites after the flesh, and especially unto the mystical, God's church and people, who are frequently called in Scripture by that name; as the ordinances and privileges of the gospel are commonly described in the Old Testament by expressions borrowed from the Levitical dispensation. And that this is the meaning of the place is evident from Isaiah 45:22, wherein all the ends of the earth are said to be sharers in this salvation.